<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#nav-list">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="/">
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    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="nav-list">
      <ul class="nav navbar-nav">
        <li class="active"><a href="/">首页</a></li>
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        <li><a href="#">产品展示</a></li>
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      </ul>
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</nav>